13-8MoPH Stainless Steel Round Bar
Grade: XM-13/13-8MoPH/UNS S13800
Size:
Cold drawn: φ4mm-φ60mm
Hot Rolled: φ16mm-φ230mm
Forged: φ230mm-φ1200mm
Surface Finish: Black Annealed, Polished Bright, Centerless Grinding
Diameter Tolerance: H9, H11, h9, h11 etc
- Fast Shipping / Ready Stock
- ISO 9001 Direct Factory
- Custom Cutting & Processing
- 100% MTC & SGS Inspection Supported
XM-13 stainless steel, commonly known as 13-8MoPH stainless steel, is a precipitation-hardening martensitic stainless steel grade designated as UNS S13800. It was developed to provide an exceptional combination of ultra-high strength, superior toughness, excellent stress corrosion cracking resistance, and good dimensional stability. The alloy is widely used in aerospace, defense, nuclear, oil and gas, and high-performance mechanical applications where reliability under severe service conditions is required.
The alloy contains approximately 13% chromium, 8% nickel, and 2% molybdenum, with aluminum additions that enable precipitation hardening. Unlike conventional martensitic stainless steels, 13-8MoPH achieves its high mechanical properties through a controlled aging process. During aging, fine intermetallic precipitates form within the martensitic matrix, significantly increasing strength and hardness while maintaining excellent toughness.
13-8MoPH stainless steel provides a unique combination of very high tensile strength, excellent fracture toughness, and superior resistance to stress corrosion cracking. The low carbon content minimizes carbide formation, improving toughness and weldability. The alloy also exhibits excellent resistance to distortion during heat treatment, making it suitable for precision components requiring strict dimensional control.
Compared with 17-4PH and 15-5PH stainless steels, XM-13 offers improved toughness and stress corrosion cracking resistance, especially in high-strength conditions. The material can be aged at different temperatures, including H950, H1000, H1050, and H1150 conditions, allowing optimization between maximum strength and maximum toughness.
13-8MoPH stainless steel bars are typically supplied in solution-treated condition and then aged to achieve the required mechanical properties. The alloy is widely used for aircraft structural components, landing gear parts, high-pressure valves, shafts, fasteners, molds, oil and gas equipment, and precision engineering components.
ASTM / JIS / EN Standards
| Standard System | Standard / Grade | Description |
| ASTM | ASTM A564 / A564M – UNS S13800 | Wrought Precipitation-Hardening Stainless Steel Bars |
| ASTM | ASTM A705 / A705M – UNS S13800 | Age-Hardening Stainless Steel Forgings |
| ASTM | ASTM A276 / A276M – UNS S13800 | Stainless Steel Bars and Shapes |
| UNS | S13800 | 13-8MoPH Stainless Steel Grade |
| AMS | AMS 5629 | 13-8Mo Stainless Steel Bar and Forgings |
| JIS | SUS 630 Equivalent Family | PH Stainless Steel (Comparable) |
| EN | No direct equivalent | Precipitation Hardening Stainless Steel |
| DIN | 1.4534 (Comparable) | X3CrNiMoAl13-8 Stainless Steel |
Stainless Steel Bar Execution Standards
| Item | Specification |
| Product Type | Round Bar, Square Bar, Hexagonal Bar |
| Manufacturing Process | Hot Rolled, Cold Drawn, Peeled, Ground, Polished |
| Heat Treatment | Solution Treatment + Aging Treatment |
| Solution Treatment Temperature | Approximately 925–955°C followed by rapid cooling |
| Aging Conditions | H950 / H1000 / H1050 / H1100 / H1150 |
| Microstructure | Low Carbon Martensitic Matrix with Precipitates |
| Surface Condition | Black Surface, Bright Surface, Ground Surface, Polished Surface |
| Dimensional Tolerance | According to ASTM A564 / ASTM A276 |
| Inspection | Chemical Analysis, Tensile Test, Hardness Test, Impact Test, Toughness Test |
| Supply Condition | Solution Treated + Age Hardened |
Chemical Composition (%)
| Element | Composition Requirement |
| Carbon (C) | ≤ 0.05 |
| Silicon (Si) | ≤ 0.10 |
| Manganese (Mn) | ≤ 0.10 |
| Phosphorus (P) | ≤ 0.010 |
| Sulfur (S) | ≤ 0.008 |
| Chromium (Cr) | 12.25 – 13.25 |
| Nickel (Ni) | 7.50 – 8.50 |
| Molybdenum (Mo) | 2.00 – 2.50 |
| Aluminum (Al) | 0.90 – 1.35 |
| Iron (Fe) | Balance |
Mechanical Properties
Typical Aging Conditions
| Property | H950 Condition | H1150 Condition |
| Tensile Strength | ≥ 1380 MPa | ≥ 930 MPa |
| Yield Strength (0.2% Offset) | ≥ 1275 MPa | ≥ 690 MPa |
| Elongation | ≥ 10% | ≥ 15% |
| Hardness | Approx. 43–48 HRC | Approx. 30–35 HRC |
| Fracture Toughness | Excellent | Superior |
| Condition | Age Hardened | Age Hardened |
| Industry | Applications |
| Aerospace Industry | Landing gear components, aircraft structures, actuators |
| Defense Industry | High-strength mechanical components |
| Oil & Gas Industry | High-pressure valves, shafts, fasteners |
| Nuclear Industry | Reactor components and precision parts |
| Mold Industry | High-strength injection molds and tooling |
| Mechanical Engineering | Gears, shafts, precision components |
| Energy Industry | Turbine and pressure equipment parts |
XM-13 stainless steel, commonly known as 13-8MoPH stainless steel, is a precipitation-hardening martensitic stainless steel grade designated as UNS S13800. It was developed to provide an exceptional combination of ultra-high strength, superior toughness, excellent stress corrosion cracking resistance, and good dimensional stability. The alloy is widely used in aerospace, defense, nuclear, oil and gas, and high-performance mechanical applications where reliability under severe service conditions is required.
The alloy contains approximately 13% chromium, 8% nickel, and 2% molybdenum, with aluminum additions that enable precipitation hardening. Unlike conventional martensitic stainless steels, 13-8MoPH achieves its high mechanical properties through a controlled aging process. During aging, fine intermetallic precipitates form within the martensitic matrix, significantly increasing strength and hardness while maintaining excellent toughness.
13-8MoPH stainless steel provides a unique combination of very high tensile strength, excellent fracture toughness, and superior resistance to stress corrosion cracking. The low carbon content minimizes carbide formation, improving toughness and weldability. The alloy also exhibits excellent resistance to distortion during heat treatment, making it suitable for precision components requiring strict dimensional control.
Compared with 17-4PH and 15-5PH stainless steels, XM-13 offers improved toughness and stress corrosion cracking resistance, especially in high-strength conditions. The material can be aged at different temperatures, including H950, H1000, H1050, and H1150 conditions, allowing optimization between maximum strength and maximum toughness.
13-8MoPH stainless steel bars are typically supplied in solution-treated condition and then aged to achieve the required mechanical properties. The alloy is widely used for aircraft structural components, landing gear parts, high-pressure valves, shafts, fasteners, molds, oil and gas equipment, and precision engineering components.
ASTM / JIS / EN Standards
| Standard System | Standard / Grade | Description |
| ASTM | ASTM A564 / A564M – UNS S13800 | Wrought Precipitation-Hardening Stainless Steel Bars |
| ASTM | ASTM A705 / A705M – UNS S13800 | Age-Hardening Stainless Steel Forgings |
| ASTM | ASTM A276 / A276M – UNS S13800 | Stainless Steel Bars and Shapes |
| UNS | S13800 | 13-8MoPH Stainless Steel Grade |
| AMS | AMS 5629 | 13-8Mo Stainless Steel Bar and Forgings |
| JIS | SUS 630 Equivalent Family | PH Stainless Steel (Comparable) |
| EN | No direct equivalent | Precipitation Hardening Stainless Steel |
| DIN | 1.4534 (Comparable) | X3CrNiMoAl13-8 Stainless Steel |
Stainless Steel Bar Execution Standards
| Item | Specification |
| Product Type | Round Bar, Square Bar, Hexagonal Bar |
| Manufacturing Process | Hot Rolled, Cold Drawn, Peeled, Ground, Polished |
| Heat Treatment | Solution Treatment + Aging Treatment |
| Solution Treatment Temperature | Approximately 925–955°C followed by rapid cooling |
| Aging Conditions | H950 / H1000 / H1050 / H1100 / H1150 |
| Microstructure | Low Carbon Martensitic Matrix with Precipitates |
| Surface Condition | Black Surface, Bright Surface, Ground Surface, Polished Surface |
| Dimensional Tolerance | According to ASTM A564 / ASTM A276 |
| Inspection | Chemical Analysis, Tensile Test, Hardness Test, Impact Test, Toughness Test |
| Supply Condition | Solution Treated + Age Hardened |
Chemical Composition (%)
| Element | Composition Requirement |
| Carbon (C) | ≤ 0.05 |
| Silicon (Si) | ≤ 0.10 |
| Manganese (Mn) | ≤ 0.10 |
| Phosphorus (P) | ≤ 0.010 |
| Sulfur (S) | ≤ 0.008 |
| Chromium (Cr) | 12.25 – 13.25 |
| Nickel (Ni) | 7.50 – 8.50 |
| Molybdenum (Mo) | 2.00 – 2.50 |
| Aluminum (Al) | 0.90 – 1.35 |
| Iron (Fe) | Balance |
Mechanical Properties
Typical Aging Conditions
| Property | H950 Condition | H1150 Condition |
| Tensile Strength | ≥ 1380 MPa | ≥ 930 MPa |
| Yield Strength (0.2% Offset) | ≥ 1275 MPa | ≥ 690 MPa |
| Elongation | ≥ 10% | ≥ 15% |
| Hardness | Approx. 43–48 HRC | Approx. 30–35 HRC |
| Fracture Toughness | Excellent | Superior |
| Condition | Age Hardened | Age Hardened |
| Industry | Applications |
| Aerospace Industry | Landing gear components, aircraft structures, actuators |
| Defense Industry | High-strength mechanical components |
| Oil & Gas Industry | High-pressure valves, shafts, fasteners |
| Nuclear Industry | Reactor components and precision parts |
| Mold Industry | High-strength injection molds and tooling |
| Mechanical Engineering | Gears, shafts, precision components |
| Energy Industry | Turbine and pressure equipment parts |
